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Finding the Fourth Proportional to 635.76, 953.64 and 419.76

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Solution

The fourth proportional to 635.76, 953.64 and 419.76 is: 629.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.76 : 953.64 = 419.76 : x
  2. Step 2: Convert to fraction form
    635.76/953.64 = 419.76/x
  3. Step 3: Cross multiply
    635.76x = 953.64 × 419.76
  4. Step 4: Simplify right side
    635.76x = 400,299.93
  5. Step 5: Solve for x
    x = 400,299.93/635.76
  6. Step 6: Final answer
    x = 629.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.